2000 Chrysler 300 M ecm PROBLEM

I had a 0601 code in the ecm. I removed it and sent it to a shop in Fla.for repairs. I have reinstalled it in the car and now it will not turn the motor over. The alarm system seems to work ok- lock and unlock the doors -but will not crank the motor. Dealer says that I must re flash the unit at the dealer only to get it to work.I requested the same unit be repaired and returned when I sent it in. What to do? remove it and send it back to the rebuilder--or tow it to the dealer for a reflash?

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